<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CssForButtonShadow</title>
    <style>
        .button01
        {
            background-color: #4CAF50; /* Green */
            border: none;
            color: white;
            padding: 15px 32px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            cursor: pointer;
            -webkit-transition-duration: 0.4s; /* Safari */
            transition-duration: 0.4s;
        }

        .button01:hover
        {
            box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,19);
        }
    </style>
</head>
<body>
<button class="button01">
    This is a button.
</button>
</body>
</html>